YEADON — An exchange of gunfire that erupted in a psychiatrist’s office on the Mercy Fitzgerald Hospital campus Thursday afternoon left a mental health caseworker dead, a doctor wounded and the suspect critically injured.

The name of the female victim killed during the shooting was not released pending notification of her family.

Authorities at the scene outside the Sister Marie Lenahan Wellness Center in the 1500 block of Lansdowne Avenue confirmed that one of the wounded is suspected shooter Richard Plotts. He remains under heavy guard at the Hospital of the University of Pennsylvania where he is listed in critical condition with three gunshot wounds.

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Dr. Lee Silverman, who works at the hospital’s outpatient psychiatric facility, located across Lansdowne Avenue from the main hospital, suffered a graze wound to the head, for which he was treated at the scene and released.

Dozens of police vehicles, including the county’s Mobile Command Center and SWAT One armored response vehicle, converged on the scene in the minutes after the shooting, reported at 2:21 p.m.

Heavily armed tactical teams swept through the Wellness Center room by room to ensure there were no additional shooters, and additional teams surrounded the outside of the building. A tight cordon was established around the hospital campus and only police - some in SWAT gear - and medical personnel were allowed to approach the scene as helicopters buzzed overhead and curious onlookers and displaced hospital staff sought information.

Officials said the shooting took place in the suite shared by Silverman and other doctors on the third floor of the facility.

“It appears there was gunfire exchanged. The doctor was in possession of a firearm and appeared to have fired on the perpetrator,” Whelan said early in the investigation.

Authorities at the scene confirmed that the doctor shot the suspect three times during the exchange, apparently acting in self-defense. Whelan was expected to release additional details once the doctor is interviewed, following his release from medical care.

“The suspect does have psychiatric issues,” Whelan added. He declined to elaborate.

Sources at the scene said Plotts was a patient at the facility. Molineux said that Plotts entered the office together with the female victim, a mental health caseworker employed by the hospital.

Authorities at the scene said it would not be unusual for a caseworker to have transported a patient for a scheduled appointment at the Wellness Center.

The district attorney said both weapons used in the shooting have been recovered.

Authorities have also confirmed that the suspect acted alone.

Law enforcement sources said the first calls came into the 911 Center at 2:21 p.m., and callers were told to shelter in place and lock their doors. Whelan said that the Rapid Response Team reacted within minutes. Officers from nearly every jurisdiction throughout Delaware County, including their chiefs, in addition to federal Alcohol, Tobacco, Firearms and Explosives agents, responded to the scene.

The hospital was on lockdown for about an hour and a half and employees and patients were evacuated from the building via police vehicles and ambulances. At least 100 people were taken to a nearby building to be interviewed as potential witnesses to the shooting. The main hospital has reopened, but ambulances are being diverted to other area hospitals.

The area around the hospital was still swarming with police as they continued their investigation Thursday night.

Molineux said that local law enforcement agencies conducted an active shooter drill at the hospital just eight months ago.

“That worked in our favor today,” Molineux said.

The Wellness Center is home to a wide range of outpatient services and physician offices, according to the Mercy Health System website.

Hospital spokeswoman Bernice Manallo Ho issued a brief statement about the incident late this afternoon.

“We are grateful for the efforts of the emergency responders and we are working with the Delaware County police departments to understand fully the details of the event and to do all we can to assist those affected,” Manallo said in the statement. “We will coordinate our communications with law enforcement and we will share information as soon as we are able.”